Circulating boiler-coupling.



J. R. STENECK.

CIRCULATING BOILER COUPLING. APPLICATION FILED ocT.27. 1-915.

FIG. 1.

Patented Dec. 19,1916.

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, ATTORNEYS.

Jomv R. STENEGK, or .OAK PARK, ILLINOIS, AssIeNon r ILLINOISMALLEABLE'IRON 00., or CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS.

CIRGULATING Bo Lnn-ooUrLInG.

I Application filed October 27, 1915. Serial No. 58,188.

' Oak Park, in the county of Cook and State of Illinois, have inventedcertain new and useful Improvements in Circulating Boiler- Couplings;and I do hereby declare that the following description of my saidinvention,

' taken in connection with the accompanyingthrough said" waste.

sheet of drawings, forms a full, clear, and

exact specification, which will enable others skilled in the art towhich thisinvention appertains to make and use the same.

This invention has-general reference to pipe fittings; and especially toa pipe fitting used on kitchen boilers to connect the water supply tosaid boiler. Its object is to prevent siphoning of the'kitchen boiler orhot water tank when the stop and waste in the supply pipe is shut offfor anyreason, and the water pipes in a building emptied My inventionconsists, essentially, in the novel and peculiar combination of parts,and details of construction, as hereinafter first fully set forth anddescribed, and then pointed out in the claims.

In the drawings already referred to, which serve to illustratethisinvention more fully, Figure 1 is a diagrammatic illustration of theoperation of my invention. Fig. 2 is a sectional elevation of a portionof a kitchen boiler provided with my improved circulating coupling. Fig.3 is an elevation of the circulating coupling detached. Fig. 4 is asectional elevation of the same, and Fig. 5 is an inverted plan thereof.

Like parts are designated by the same characters and symbols ofreference in all the figures. p i

A, in these drawings designates the usual kitchen boiler. It ispreferably a cylindrical vessel containing the water to be heated in anysuitable manner, and it is closed at its top by a head 12, in whichthere is an opening fitted with an internally screwthreaded spud 13,within which the coupling proper is securely fitted. This couplingcomprises a so-called tail-piece 14:, being a tubular member, the lowerend of which is externally screw threaded'to engage the internal screwthread of the spud 13, and the upper end of which is provided with alaterally extending flange 15.

16, designates the male part of the cou- Specification of LettersPatent.

Patented ne -19, 1916.

pling. It is either a straight tubular memher, as shown in-Figs. 3 and4,:or:a curved run STATES PATENT orrroni f element, 17 usually termedthe elbow, as

illustrated in Figs. 1 and 2. This male parthas at its lower- .end anenlargement 1 8, which is externally screw-threaded and con structed toreceive theusual coupling nut 19, and its other extremity is internallyscrewthreaded at 20, to connect'with the water supply pipe 21. j

The lower extremity of the tail-piece 1 1 is internally screw-threadedat 2 1, where with connects a downwardly depending pipe 22 which extendsto within a reason-' able distance of the bottom of the boiler and 5which pipe 22 constitutes the feed pipe for the same. s

In the'threaded portion 21" of the tailpiece there are a series ofgrooves or notches 23, preferably in axial alinement with the axis ofthe bore; of the tail-piece 24:, though not necessarily so, said groovesforming, as itwere, a series of passages which passages terminate in anenlargement 40, in the bore of the tail piece, said passages connectingthe upper space in the boiler A withthe interior of the tail-piece 14,,pastthe extreme end of the pipe 2 1 From the boiler A leads a dischargemember 2A which 'connects'the boiler with thehot-water pipe system 28,of a building,'etc., and which, being of the usual type,needs nodetailed description. I v I In operation, waterfrom the watermain orother source of supply 30, enters the tankor boiler A through the pipes21 and- 22 and is forced by the pressure in the boiler A through theescape or discharge pipe24 to I the hot watersystem' 28, while at thesame time the cold 'water system is supplied by the riser 31. i Y

When repairs inthe water system of a building become necessary, and theusual stop-and-waste valve 27 at the lowest point of'the water supply isturned to cut ofl said I water supply .and to empty the system, thesuction caused by the discharge of water from the hot-water system 28into the tank or boiler A, would cause the boiler A to overflow throughthe pipe 22, and by the siphoning action started by this inflowing 7water through the pipe 24: into the tank A would cause the latter to beemptied, which, in cases where the boiler is connected with,

and its water heated by, a heater 26, might the colder and the coldestpart of the win-,

ter, when house heating systems are usually forced to their fullestcapacity, and when during the night but little or any water is drawnfrom the hot water system, and where the kitchen boiler is connected tothe house heating system, by a coil 26, or similar contrivance, steamwill be generated in the tank A, which will force the water inthe tankback into the water main 80, and, after being finally condensed, willcause the-for matlon of a vacuum in the tank A, as it has frequentlyhappened, and the collapsing of the boiler caused by atmosphericpressure.

I am aware that it is customary to drill in the pipe 22, adjacent thehead of the boiler, a small hole to provide for a vent,

but it is also a fact that the accumulation jected to: all theobjections aforesaid.

By providing the series of grooves 23 in the tail piece which groovesare preferably produced in the process of casting of the tail piece, Ihave provided for a multiplicity of these vents without adding anythingto the cost of production of the said tail piece, and at the same time Ihave-avoided the necessity of drilling the said small hole, whichdrilling is frequently omitted to be performed, and many times entirelyforgotten.

Having thus fully described this invention, I claim as new and desire tosecure by Letters Patent of the United States- 1. In a hot water system,a stand boiler, a circulating coupling connected to said stand boiler,said circulating coupling comprising a male-piece, a tail-piece, and acoupling nut, constructed to separably connect said male, and said tail,pieces, said tail-piece having its lower vend reduced in diameter Copiesof this patent may be obtained for and its lower terminal internallyscrew threaded, there being in the terminal portion of said tail-pieceinternal screw-threads and a serieszof grooves cut through thesethreads, and an inlet pipe engaging with one end said internalscrew-thread.

2. A circulating boiler coupling, comprising, in combination, amale-member, a tailpiece, a coupling nut on said tail piece constructedto connect the tail and male-pieces, said tail-piece having at its lowerterminal an internally screw-threaded bore, there being in said bore aseries of grooves or indentations, and a discharge pipe constructed toengage the internally screw-threaded portion of the tail-piece,,wherebysaid grooves 'aiford passages past the terminal of said discharge-pipeinto the bore of the tail-piece, said grooves being formed in thesaidtail piece by removing portions of the internal screw threads and partsof the interior wall of said tail piece,.there being an enlargement inthe bore of said tail piece in which said grooves terminate.

3. In an instalment of the nature described, a hot water tank, said tankcomprising a shell, said shell having a bottom and a head; a cold watersupplypipe; a circulating union coupling, said coupling comprisinga malepiece, a nut, and a tail piece, said tail piece being constructed toengage the head of said tank, there being in the bore of the lower endof said tail piece a female thread, and in said tail piece an enlarged.chamber, portions of said female thread being removed to 'aiford aseries of passages between the interior of the tank and the interior ofsaid chamber; a pipe constructed to engage said interior screw thread; aheating device connected to said tank; a hot water system; a dischargeelement connected to the head of said tank, and a cold water system,likewise connected to said tank. V i

In testimony that I claim the foregoing as my invention I have hereuntoset my hand at Chicago, 111., this 22d day of October, 1915. f

JOHN It. STENECK.

five cents each, by addressing the Gommissioner of Patents, Washington,D. G. i

